ios - 使用 NSUserdefaults(xcode,swift2) 保存 datePicker 值

Question

我们如何通过 nsuserdefaults 或其他方式保存日期选择器的值。例如，如果一个人选择下午 5 点，那么当他返回应用程序时，他应该在日期选择器上看到下午 5 点。我不知道如何将 nsusersdefault 包含在下面的内容中代码

@IBAction func NotificationButtonTapped(sender: AnyObject)
{
    cancelLocalNotificationsWithUUID("NotificationID")

    //dateformatter for alert
    var dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "hh:mm a"
    var strDate = dateFormatter.stringFromDate(datePicker.date)

    var notifications:UILocalNotification = UILocalNotification()
    notifications.fireDate = datePicker.date
    notifications.timeZone = NSTimeZone.defaultTimeZone()
    notifications.applicationIconBadgeNumber = UIApplication.sharedApplication().applicationIconBadgeNumber + 1
    notifications.soundName = UILocalNotificationDefaultSoundName
    notifications.repeatInterval = NSCalendarUnit.CalendarUnitDay
    notifications.userInfo = ["UUID": "NotificationID"]
    notifications.alertBody = "Quote of the day"
    UIApplication.sharedApplication().scheduleLocalNotification(notifications)
  }

Answer 1

您可以执行以下操作:

var datePicker = /* Get Your Date Picker from somewhere */

// Store value using User Defaults
let currentDate = datePicker.date
NSUserDefaults.standardUserDefaults().setObject(currentDate, forKey: "Current-Date")

// Retrieve Value using User Defaults
if let date = NSUserDefaults.standardUserDefaults().objectForKey("Current-Date") as? NSDate {
    datePicker.setDate(date, animated: true)
}